Question
Harry folded 10 paper frogs on the first day. Each day he did 2 more paper frogs than the previous day. On the last day, he made 40 frogs. How many days did he fold paper frogs?
2 m

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Harry folded 10 paper frogs on the first day. Each day he did 2 more paper frogs than the previous day. On the last day, he made 40 frogs. How many days did he fold paper frogs?